They were not challenged once during the night, by a miracle.

Their pioneering work was never once challenged by the act.

The chess club meets after school once a week in the library and members challenge each other.

Which of us doesn't, once challenged with being afraid!

Truax was once challenged to show how he makes an instrument.

She's herself married, and her husband once challenged Alex in a boxing match after he found out their affair.

The barbarians hadn't even placed guards, I wasn't challenged once.

On the episode aired September 27, 2009, the production team were once challenged again by the crew.

Evolution by the way was once challenged to even be allowed to be taught in schools.

A gentile once challenged the sage to explain the law while standing on one foot.